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PELCO-P协议

时间:2011-07-21      阅读:6419

 

 
PELCO "P" PROTOCOL
GENERAL
This section describes the protocol used when sending commands to an Intercept Dome in the “P” version protocol. The protocol uses no parity, one start bit, eight data bits, and one stop bit. The recommended baud rate is 4800 (4800, 8, N, 1, 1).
 
MESSAGE FORMAT
 

Byte
Value
Function
1
$A0
STX (start transmission)
2
$00 to $1F
Address
3
Data byte 1
(see below)
4
Data byte 2
(see below)
5
Data byte 3
(see below)
6
Data byte 4
(see below)
7
$AF
ETX (end transmission)
8
$00-$FF
Check Sum

 
Byte 1 is always $A0
Byte 2 is the receiver address, set by DIP switch in the receiver
Byte 3-6, see below
Byte 7 is always $AF
Byte 8 is an XOR sum of Bytes 2-6
 
The protocol is “zero indexed” so that the hexadecimal address sent in the protocol for the first receiver is $00 which corresponds to address 1.
 
The bits within the “Data bytes” are broken up into two main groups. For Pan and Tilt commands, the functions are determined as follows:
 
PAN AND TILT COMMANDS
 

 
Bit number
 
7
6
5
4
3
2
1
0
Data 1
0
Camera On
Autoscan On
Camera on / off
Iris Close
Iris Open
Focus Near
Focus Far
Data 2
0
Zoom Wide
Zoom e
Tilt Down
Tilt Up
Pan Left
Pan Right
0 (for pan / tilt)
Data 3
Pan Speed $00 to $3F and $40 for Turbo
Data 4
Tilt Speed $00 to $3F

 


EXTENDED COMMAND SET
 
The extended command set will have bit 0 of data byte 2 set and will follow the format in the following table:
 

Command
Data byte 1
Data byte 2
Data byte 3
Data byte 4
Set Preset XX
00
03
00
01 to FF
Clear Preset XX
00
05
00
01 to FF
Go To Preset XX
00
07
00
01 to FF
Flip (rotate 180º)
00
07
00
21
Zero Pan Position
00
07
00
22
Set Aux XX
00
09
00
01 to 08
Clear Aux XX
00
0B
00
01 to 08
Remote Reset
00
0F
00
00
Zone Start
00
11
00
01 to 08
Zone End
00
13
00
01 to 08
Write char to screen
00
15
0 to 28
0 to 7F
Clear Screen
00
17
00
00
Alarm Ack
00
19
00
01 to 08
Zone Scan On
00
1B
00
00
Zone Scan Off
00
1D
00
00
Pattern Start
00
1F
00
00
Pattern Stop
00
21
00
00
Run Pattern
00
23
00
00
Zoom Lens Speed
00
25
00
00 to 03
Focus Lens Speed
00
27
00
00 to 03

 
The receiver will respond with an ACK.
 
To accommodate features of new systems and maintain compatibility with our old systems, some functions have been added through the use of some of the unused preset functions. These are:
 

Preset Number
Function
99
Begin Auto-scan
98
Begin Frame Scan
97
Begin Random Scan
96
Stop Scan
95
Enter Menu Mode
94
Remote Reset
93
Set Right Limit Stop
92
Set Left Limit Stop
34
Home (return to 0 pan position)
33
Flip

 
Examples:
 
To SET PRESET 32 in the receiver with address 1, the command string (in Hexidecimal) would be:
 
         A0 01 00 03 00 20 AF 17 (the last byte is the XOR sum of bytes 2 through 6)
 
To drive receiver with address 2 LEFT at half speed:
 
         A0 02 00 04 00 1F AF 19
 
 
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